Petkov, I.V. “The Boundary Behavior of Homeomorphisms of the Class Wloc1,1 on a Plane by Prime Ends”. Reports of the National Academy of Sciences of Ukraine, no. 6 (June 28, 2015): 19–23. Accessed June 20, 2026. https://nasu-periodicals.org.ua/index.php/dp/article/view/14999.